Improvement in bench-dogs



UNITED STATES PATENT OFFICE.

WILLIAM LYLE, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN BENCH-DOGS.

Specification forming part of Letters Patent No. l9l,693, dat ed J une 5, 1877 application filed May 17, 1877.

- easily aflixcd to a earpenter s bench, or to a temporary substitute tlerefor, and as easily detaehed.

In the aceompaying drawing, Figure 1 is a perspective View ot' myimprovcd bench-bit Fig. 2, a vertical section of the same; Fig. 3, a perspeetivc View of the bit inverted, and

Fig. 4 illustrates a plan of making the bit of wrought-iron or steel.

The bits to which my invention relates are such as are used iu connection with earpenters benches for resisting the tlrusts inparted to wood by a plane.

My improved bit, as shown in Figs. 1 and 2, consists of a plate, a, on the under side ot' which are two tapering projeetions, d d, at the rear, and one similar projection,`b, at the front, all tliese projections being inclined downward from front to rear, for a purpose rendered apparent hereinafter.

The front edge of the plate is prcferably reeessed at e, so as to form two projections, f f, which are reduced in thiekness from the under side, as shown in Fig. 2, and made comparatively sharp, soas to penetrate the WOOd which is pushed against them.

The bit is preferably made of malleable cast-iron, so that it will resist the blows required for driving itinto the Wood B, this driving being easily aecomplished by blows imparted to the top of the plate.

While the bit cannot be removed by pressure such as a plane will impart to the front end. through the medium ot' the Wood operated upon, it'cau be easily withdrawn by a ehisel, screwdriver, or other like implement, inserted beneath the projections f f, and used as a lever, the inelinations of the projections b and d permittng this ready witldrawal.

It is this facility of applying and withdrawing the bit which renders it especially useful for jobbing earpenters who may have to make use of a plank, beam, or trestle as a tcnpora ry bench. v

There may be two projeetions, b, in front; but I prefer one only.

The bit may be made of wroughtiron or steel in the nanner shown in Fig. 4-that is, by first cutting out or striking` up a plate ot' the form there illustrated, and then bending down the projections b' and d' to be driven into the Wood. I, however, pref'er to make the bit of malleable east-iron.

I claim as my invention- A carpenter s bit, consisting ot' a pinte, a, having tapering projections nelined downward from the front to the rear oi' the said plate, all substantially as set forth.

In testimony whereof I have signed my name to this specifieation in the presence of two subscribing witnesses.

WILLIAM LYLE.

Witnesses:

HERMANN MoEssNER, HARRY SMITH. 

